Vintage Krell

I had KMA 100's, same vintage and design as the KSA 200's. They were fabulous sounding amps. After twenty carefree years one of the output stages let go. It is what happens to full bore Class A amps. Semiconductors may be more tolerant of heat now but they were not back then. Just like an incandescent bulb you can only turn them on and off so many times. So my advise is stay away. Even having it rebuilt will not guarantee either longevity or sound quality. 

I owned Krell KMA 100s. They were wonderful amps. They "fried" at about 20 years of age. The semiconductors they used back then were not as temp resistant so they used a fan driven chimney set up. Fan drew air from the bottom of the amp and exhausted it on top. They warned you not to put the amps down on carpet. Anyway, Dan D'Agustino who not longer owns Krell really pissed me off on a preamp issue so I sold the amps to a fellow who thought he could fix the one that blew and given Dan's customer support philosophy I swore off his products entirely and warn others to stay away. 
My own philosophy is that a bank full of dollars is no fun. I am sure I will die with very little. My wife will get it all and she deserves every penny for putting up with me for all these years.    

Spinaker you made the right choice. You get a lot more money for them before they blow then after. Every last one will blow it's output stage eventually just light an incandescent light bulb. But, they were a great performing amp. They certainly opened my eyes (ears) as to what was possible with ESLs. I discovered that ESLs had no problem going real loud and being real dynamic with the right amp. 

The KMA 100s ran class A up to the rated power. The amp always seemed a lot more powerful than 100 ways. They never ran out of steam. Getting to 100 dB on full range ESLs, no sub was easy. I suspect they kept going in AB mode. The power supply was huge.